Shapeways is a website where you can create, upload 3D models, and they will 3D print (technical term would be “additive manufaturing”) for you for a certain price. You can also go to the website and browse the premade parts and purchase them.
Shapeways have a huge material selection, from plastic to all kinds of metal. Here is a list of the materials they provide:
Strong & Flexible Plastic (Various Colors)
Metallic Plastic
Frosted Detail Plastic
Acrylic Plastic (Detail Plastic)
Stainless Steel
Precious Metal (sliver, brass, bronze, gold, platinum, rhodium)
Sandstone
Wax
Porcelain
Aluminum
High Definition Acrylate
PLA
In order to 3D print different materials, they have various additive manufacturing methods:
Stereolithography (SLA)
Selective Laser Sintering (SLS)
Direct Metal Laser Sintering (DMLS)
Fused Deposition Modeling (FDM)
Polyjet
Binder Jetting